Bone Abstracts

Purpose: To study the value of the central vertebral height restoration by kyphoplasty for treatment of biconcave vertebral compression fractures.

Method: Review the patients with the single biconcave vertebral compression fracture receiving kyphoplasty treatment from 2006 to 2013 (49 cases, 13 males and 36 females) According to Genant classification, with the central vertebral compression ratio, they are divided into type II (<25%, 11 cases), type II (25–40%, 26 cases), type III (> 40%, 12 cases). The expected recovery height is the average of the anterior and posterior edge. According to the ratio of achieved height/expected recovery height, it is divided into level A (60~80%), level B (60~80%), level C (<60%). Type I patients are mild deformity pre-operation and level IA (11 cases); type II patients are moderate deformity pre-operation and level IIA (12 cases) and level B(14 cases) post-operation, type III patients are sever deformity pre-operation and level IIIA (2cases) and level IIIB (3 cases) and IIIC (7 cases) post-operation. Bone cement leakage are followings: type I 1 case (1/11); type II 11 cases (11/26) type III 6 cases (6/12). Patients were followed up 24-84 months. Analyze the VAS and ADL score of each group of pre-operation, 1 day, 3 months, 1 year, 2 year follow-up.

Result: The scores of VAS and ADL were significantly better than pre-operation, and there was no significant difference between 2 years and 3months follow-up. When it comes to bone cement leakage, with the increase of the degree of fracture, the incidence of bone cement leakage is gradually increasing. The bone cement leakage rates of type II and III were significantly higher than type I.

Conclusion: Both short and long term effect of kyphoplasty for the treatment of biconcave compression fractures is preferable. For moderate and severe compression fractures, it has no significant effect whether the central vertebral height has been recovered, but the bone cement leakage rate was significantly increased. Therefore, we should not insist restoration of the central height when treating biconcave compression fractures.